add README section to summarize purpose/philosophy

Merge branch 'develop' into stable

prepare for release

fix doc typos

use new collection expression syntax

migrate to file-scoped namespaces

update test packages

fix build warnings

add comment for clarity

Merge pull request #127 from F2/f2/fix-absolute-paths-on-unix

Maybe this is a cleaner fix

Ensure absolute paths are actually http(s)

Merge branch 'develop' into stable

prepare for release

Merge pull request #126 from Jericho/non_seekable